package com.wfl.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.wfl.reggie.common.CustomException;
import com.wfl.reggie.dto.DishDto;
import com.wfl.reggie.dto.SetmealDto;
import com.wfl.reggie.entity.Dish;
import com.wfl.reggie.entity.DishFlavor;
import com.wfl.reggie.entity.Setmeal;
import com.wfl.reggie.entity.SetmealDish;
import com.wfl.reggie.mapper.SetmealMapper;
import com.wfl.reggie.service.SetmealDishService;
import com.wfl.reggie.service.SetmealService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {

    @Autowired
    private SetmealDishService setmealDishService;
    /**
     * 新增套餐，同时需要保存套餐和菜品的关联关系
     * @param setmealDto
     */
    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {
        //保存套餐的基本信息，操作setmeal，执行insert操作

        this.save(setmealDto);

        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();

        setmealDishes.stream().map((item) ->{
           item.setSetmealId(setmealDto.getId());
           return item;
        }).collect(Collectors.toList());

        //保存套餐和菜品的关联关系，操作setmeal_dish,执行insert操作
        setmealDishService.saveBatch(setmealDishes);
    }

    /**
     * 删除套餐，同时需要删除套餐和菜品的关联数据
     * @param ids
     */
    @Transactional
    public void removeWithDish(List<Long> ids) {

        //select count(*) from setmeal where id in(1,2,3) and status = 1
        //查询套餐状态，确定是否可删除
        LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(Setmeal::getId,ids);
        queryWrapper.eq(Setmeal::getStatus,1);

        int count = this.count(queryWrapper);
        if (count > 0){
            //不能删除，抛出业务异常
            throw new CustomException("套餐正在售卖中，无法删除");
        }

        //可以删除，先删除套餐表中的数据
        this.removeByIds(ids);


        //delete from setmeal_dish where setmeal_id in (1,2,3)
        LambdaQueryWrapper<SetmealDish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.in(SetmealDish::getSetmealId,ids);
        //删除关系表中的数据
        setmealDishService.remove(lambdaQueryWrapper);
    }

    /**
     * 根据id查询套餐信息和对应菜类
     * @param id
     * @return
     */
    public SetmealDto getByIdWithFlavor(Long id) {
        //查询套餐基本信息
        Setmeal setmeal = this.getById(id);
        SetmealDto setmealDto = new SetmealDto();
        //拷贝
        BeanUtils.copyProperties(setmeal,setmealDto);

        //查询当前套餐所对应的菜类
        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SetmealDish::getSetmealId,setmeal.getId());
        List<SetmealDish> setmealDishes = setmealDishService.list(queryWrapper);

        setmealDto.setSetmealDishes(setmealDishes);
        return setmealDto;
    }



    /**
     * 修改套餐
     * @param setmealDto
     */
    @Override
    @Transactional
    public void updateWithFlavor(SetmealDto setmealDto) {
        //修改套餐信息
        this.updateById(setmealDto);


        //清理当前套餐中的菜类
        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SetmealDish::getSetmealId,setmealDto.getId());
        setmealDishService.remove(queryWrapper);


        //添加当前提交过来的菜类
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes = setmealDishes.stream().map((item) -> {
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());

        setmealDishService.saveBatch(setmealDishes);
    }


}
